<%--
  Created by IntelliJ IDEA.
  User: WuLiangHang
  Date: 2021/12/20
  Time: 11:18
  To change this template use File | Settings | File Templates.
--%>
<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<html>
<head>
    <title>Title</title>
</head>
<body>
<%
    request.setAttribute("key", "value");
%>
JSP 表达式输出的 key = <%=request.getAttribute("key1") == null ? "" : request.getAttribute("key1")%> <br/>
EL 表达式输出的 key = ${key1} <br/>
</body>
</html>
